Study: Humble clays may have been birthplace of life on Earth

Nov. 5, 2013 at 4:45 PM

ITHACA, N.Y., Nov. 5 (UPI) -- Clay may have been the birthplace of life on Earth despite being a seemingly infertile and inhospitable blend of minerals, some U.S. scientists say.

Life, or at least the complex biochemicals that make life possible, could have formed within a kind of clay known as a hydrogel, containing a mass of microscopic spaces capable of soaking up liquids like a sponge, Cornell University biological engineers report in the journal Scientific Reports.

"We propose that in early geological history clay hydrogel provided a confinement function for biomolecules and biochemical reactions," biological and environmental engineering Professor Dan Luo said.

In seawater, clay forms a hydrogel, and over billions of years chemicals confined in those spaces could have carried out the complex reactions that formed proteins, DNA and eventually all the machinery that make a living cell work, the Cornell researchers suggest.

The noted that geological history shows clay first appeared on Earth -- as silicates leached from rocks -- just at the time biomolecules began to form into protocells and eventually membrane-enclosed cells.

The geological events matched nicely with biological events, they said.

Related UPI Stories
Latest Headlines
Trending Stories
Study: Elephants rarely get cancer
Study: Lithium safe, effective for bipolar disorder in children
Study: Melting of Antarctica's ice shelves to intensify
8 things you didn't know about baby gorillas
Study: Africa's urban waste could produce rural electricity